Aurela, M., Saarikoski, S., Niemi, J. V., Canonaco, F., Prevot, A. S. H., Frey, A., … Hillamo, R. (2015). Chemical and source characterization of submicron particles at residential and traffic sites in the Helsinki metropolitan area, Finland. Aerosol and Air Quality Research, 15(4), 1213-1226. https://doi.org/10.4209/aaqr.2014.11.0279